00278nam a2200121Ia 4500008004100000082001300041245002500054260002500079300001000104490000900114600002000123650001300143140224s9999    xx            000 0 und d  a575 H7.1  aAdvances in agronomy  bAcademic pressc1970  a462p.  av.22  aN.C. Brady, ed.  aAgronomy